Lily Allen has hit back at Katie Hopkins for describing her as "looking pretty hideous" during pregnancy, accusing the ex-Apprentice star of being insensitive about the loss of her unborn children.

Hopkins stated in an interview with Heat that she lost interest in Allen when she briefly removed "herself from the spotlight because she wanted to be a mother, [which] largely involved gaining two stone and looking pretty hideous."

Responding to Hopkins's comments on Twitter, the singer and mother-of-two explained that she stopped exercising during pregnancy because she was "pretty much on bed rest" and "didn't want to take any risks" after suffering miscarriages in 2008 and 2010.

"Yes, after tragically loosing a child so late in to my pregnancy I may have gained a few pounds,I am one of many that find comfort in food," Allen started.

"The two pregnancies that followed were terrifying because of what had happened before and I was pretty much on bed rest for 20 months.

"I wasn't exercising because I didn't want to take any risks, and funnily enough, the survival of my children felt more important than being...thin."

The 'Air Balloon' singer also addressed Hopkins's complaint that she is "only famous for having a famous dad" in actor Keith Allen, arguing: "I doubt that most of my fan base have a clue who my father is."

Allen then apologised to her followers, explaining that her children "are a touchy subject".

She vowed to delete her tweets, conceding that she gave Hopkins "exactly what she wanted by responding".